Upgraded xwiki to 7.0.1, which requires an application container that supports the Servlet v3.0 specification

A few pedigree interface improvements

This version of PhenoTips now requires an application container that supports the Servlet v3.0 specification. In particular, this means that Tomcat 6, the version available in RHEL/CentOS 6.x, is no longer supported, and Tomcat 7 is required. In RHEL/CentOS 6.x, this can be installed from the EPEL repository.